Load plugin templates along with theme

What is the setting so that plugin templates are considered along with theme templates?
For example on submitting form, form.md can be displayed.

Plugins can automatically provide templates (e.g. archives, breadrumbs, feed, etc). You need to register the path to templates in the onTwigTemplatePaths() method. This will get found by Grav automatically if you name them properly.

The Theme will always override any template with the same name from a plugin however.